Mitsubishi Outdoor Unit Split-Type Air Conditioner MUZ-AP25VG

Connect the compressor and activate the inverter

Compressor connected and inverter activated

Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit

Heating or cooling operation started

Time from the start of compressor to the stop of compressor due to overcurrent

Sign off on the compressor operation time check

Warning: Disconnect the connector between the compressor and the power module (IC700) before proceeding

Ohmmeter zeroed before measurement

Resistance measurement between BLK-WHT

Resistance measurement between BLK-RED

Resistance measurement between WHT-RED

Sign off on the compressor winding check

Warning: Ensure the connector between the compressor and the power module (IC700) is disconnected before starting the procedure.

Inverter is normal after activation

Measure the voltage balance between the terminals. Expected output voltage is 50 - 130 V.

Operation method: Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit.

Measurement point: Measure AC voltage between the lead wires at 3 points.

Voltage between BLK (U)-WHT (V)

Voltage between BLK (U)-RED (W)

NOTE: 1. Output voltage varies according to power supply voltage. 2. Measure the voltage by analog type tester. 3. During this check, LED of the inverter P.C. board blinks 9 times.

(1) Remove the cabinet and panels. (Refer to section 1.)

(2) Disconnect the following connectors:

Warning: Ensure the device is powered off before starting the procedure.

Lead wire to the reactor disconnected

Disconnect the following connectors

Discharge temperature thermistor pulled out from its holder

Defrost thermistor pulled out from its holder

Upload a photo of the defrost thermistor after removal

Outdoor heat exchanger temperature thermistor pulled out from its holder

Upload a photo of the outdoor heat exchanger temperature thermistor after removal